just one finance question

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As the risk management of a small chain of restaurants, you are analyzing the losses incurred over the last 10 years. Using these data, calculate the:

Years Losses

Years 1-2 1200

Year 3 1000

Years 4-6 800

Year 7-8 500

Years 9-10 100

a) Expected value of losses

b) Variance

c) Standard Deviation

d) Coefficient of Variation

e) In what (approximate) range should losses fall 95 percent of the time?